In this schematic the "Bolt-flanged,10x16" is used most often.
Parts such as the Swingarm: Washer-plain-small,14, Nut,lock,flanged,10mm, Ring-snap, Pin,cotter are included in the Kaf400-bdf Mule600 2013 Usa Swingarm parts fiche.
The most reasonably priced component used on the Kaf400-bdf Mule600 2013 Usa Swingarm is the Washer-plain-small,14.